@article{MM2_1980__33_154745,
     author = {S.K. Sehgal and G.H. Cliff},
     title = {Group {Rings} with {Units} {Torsion} {Over} the {Center.}},
     journal = {Manuscripta mathematica},
     pages = {145--158},
     publisher = {mathdoc},
     volume = {33},
     year = {1980},
     zbl = {0449.20011},
     url = {http://geodesic.mathdoc.fr/item/MM2_1980__33_154745/}
}